sedimentary
Sandstone
Sedimentary rock composed mainly of quartz sand
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale, typically brown, tan, or reddish, dull luster, granular texture.
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Physical properties
Hardness 6-7 on Mohs scale, typically brown, tan, or reddish, dull luster, granular texture.
Formation & geological history
Formed by the accumulation, compaction, and cementation of mineral particles or rock fragments, often in desert or aquatic environments over millions of years.
Uses & applications
Widely used in construction, paving, and as a decorative building stone.
Geological facts
Sandstone formations like Zion National Park showcase spectacular wind-blown cross-bedding patterns.
Field identification & locations
Easily identified by its gritty, sandpaper-like texture and visible mineral grains. Found globally in riverbeds, deserts, and ancient marine deposits.
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Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
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Sandstone
Arenite
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Shale
Shale (clastic sedimentary rock)
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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